[Puppet Users] upgrading

I want to upgrade from puppet 0.24.8 to the latest puppet, and do I need to modify my puppet code to fit for 0.26? and another thing, I want to have multi-puppet server node, and 1 as the master, and the others as the slave. master serves for the most time, but when master is down, slave becomes t

[Puppet Users] err: Could not retrieve catalog: Could not parse for environment production: Could not find file /etc/puppet/manifests/site.pp warning: Not using cache on failed catalog

I change my ubuntu to mac os, and rsync my puppet file to the puppet server. I run puppetd -tv in the client, and then this error happens puppetd -tv err: Could not retrieve catalog: Could not parse for environment production: Could not find file /etc/puppet/manifests/site.pp warning: Not using cac